Rear End Narrowing ?s

If you want to center your wheels better, wouldn't it be better to get wheels with a different backspacing? Or make your existing wheel wider, but only on the inside.
That would save you a lot of trouble for the 1/2" of narrowing the axle. Plus you would be using green bearings which will probably not hold on as long as your tapered bearings.
Just my 2 cents.

Antoon